X0206 3 2020-07-22 0 0001643615 Montrose Environmental Group, Inc. MEG 0001501277 LeMaire Joshua W. 1 PARK PLAZA, SUITE 1000 IRVINE CA 92614 0 1 0 0 Chief Operating Officer Common Stock 200 D Stock Option (Right to Buy) 6.03 2026-06-23 Common Stock 187875 D Stock Option (Right to Buy) 24.00 2029-01-10 Common Stock 20460 D Stock Option (Right to Buy) 31.60 2030-01-01 Common Stock 18892 D This option represents the fully-vested right to purchase a total of 187,875 shares of the Issuer's common stock, par value $0.000004 (the "Common Stock"). This option represents the right to purchase a total of 20,460 shares of the Common Stock, 6,820 of which have vested with the remaining shares vesting in two equal annual installments on January 10, 2021 and January 10, 2022, subject to the Reporting Person's continued service to the Issuer. This option represents the right to purchase a total of 18,892 shares of the Common Stock which will vest in three equal annual installments on January 1, 2021, January 1, 2022, and January 1, 2023, subject to the Reporting Person's continued service to the Issuer. Exhibit 24.1 - Power of Attorney /s/ Nasym Afsari, Attorney in fact 2020-07-22